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Submitted on: 28 February 2015.
Revised on: 05 April 2015.
Accepted on: 27 April 2015.
TRANSFORMATION GROUPS
Submitted on: 18 April 1998.
Revised on: 19 May 1998.
Accepted on: 08 June 1998.
TRANSFORMATION GROUPS
Submitted on: 22 October 2010.
Revised on: 03 November 2010.
Accepted on: 08 November 2010.
TRANSFORMATION GROUPS---SPRINGER BIRKHAUSER
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